If you need to withdraw from a single course (as long as it is not your only class) in the Fall or Spring semester, for most classes, this is done in SIS; see the University Registrar's page on class ...

Students may repeat any course in an effort to improve grades and/or to improve understanding of the course content. Students are encouraged to seek advice of an academic advisor before repeating ...

While the content and focus of feedback offered to students will depend on each individual course and assignment, several principles transcend disciplinary boundaries. When setting up feedback ...

Modification of a course schedule during the drop/add time period is accomplished through WyoWeb (web registration). After the end of the drop/add period, (see Calendar) individual class withdrawals ...